Place and rotate family acording to ifc-element

Hi, I have the following task:
I get provision for void via ifc. In my Revitmodel I want to place the corresponding voidfamilies.
My problem with is, I can’t get the rotation of the elements. The converted ifc-elements are not families and so all nodes give error messages.
I tried boundingboxes, but they align to the model and not the element…
Any idea how to do this?